A high-entropy ceramic oxide is used as the cathode for the first time for proton-conducting solid oxide fuel cells(H-SOFCs).The Fe0.6Mn0.6Co0.6Ni0.6Cr0.6O4(FMCNC)high-entropy spinel oxide has been successfully prepared,and the in situ chemical stability test demonstrates that the FMCNC material has good stability against CO2.The first-principles calculation indicates that the high-entropy structure enhances the properties of the FMCNC material that surpasses their individual components,leading to lower O2 adsorption energy for FMCNC than that for the individual components.The H-SOFC using the FMCNC cathode reaches an encouraging peak power density(PPD)of 1052 mW·cm-2 at 700℃,which is higher than those of the H-SOFCs reported recently.Additional comparison was made between the high-entropy FMCNC cathode and the traditional Mn1.6Cu1.4O4(MCO)spinel cathode without the high-entropy structure,revealing that the formation of the high-entropy material allows the enhanced protonation ability as well as the movement of the O p-band center closer to the Fermi level,thus improving the cathode catalytic activity.As a result,the high-entropy FMCNC has a much-decreased polarization resistance of 0.057 Ω·cm2 at 700℃,which is half of that for the traditional MCO spinel cathode without the high-entropy design.The excellent performance of the FMCNC cell indicates that the high-entropy design makes a new life for the spinel oxide as the cathode for H-SOFCs,offering a novel and promising route for the development of high-performance materials for H-SOFCs.

Yangsen XU;Xi XU;Lei BI

School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China;Department of Materials,Imperial College London,London SW72BP,UK

先进陶瓷（英文版）

[1]Yangsen XU;Xi XU;Lei BI-.A high-entropy spinel ceramic oxide as the cathode for proton-conducting solid oxide fuel cells)[J].先进陶瓷（英文版）,2022(05):794-804

6Cr0,6O4,FMCNC,6Cu1,4O4

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